National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 71. South wind around 6 mph.

    Low: 71 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Northwest wind 6 to 10 mph becoming northeast in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 30%.

    High: 85 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Northeast wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    Low: 60 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Monday

    Monday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 72. East northeast wind 13 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 72 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 55. East northeast wind 10 to 13 mph, with gusts as high as 18 mph.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 68. Northeast wind around 14 mph, with gusts as high as 20 mph.

    High: 68 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 53. North northeast wind 6 to 11 mph, with gusts as high as 16 mph.

    Low: 53 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 71. South wind around 6 mph.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Northwest wind 6 to 10 mph becoming northeast in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Northeast wind 9 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 72. East northeast wind 13 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 55. East northeast wind 10 to 13 mph, with gusts as high as 18 mph.
Tuesday
Mostly cloudy, with a high near 68. Northeast wind around 14 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 53. North northeast wind 6 to 11 mph, with gusts as high as 16 mph.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 54.
Thursday
Partly sunny, with a high near 73.
Thursday Night
Mostly cloudy, with a low around 56.
Friday
Partly sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 78.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
9:57 pm CDT Sep 19, 2026
Forecast Valid:
12am CDT Sep 20, 2026-6pm CDT Sep 26, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation